When adding additional Characterset directives to the pure-ftpd configuration it fails to start with a notice similar to the following:
hostname pure-ftpd: (?@?) [ERROR] Unknown run-time option
hostname pure-config.pl: /usr/sbin/pure-ftpd: invalid option -- '9'
This occurs due to an upstream change to pure-ftpd that removed this functionality from the free version of pure-ftpd as of version 1.0.48.
Support for RFC 2640 has been removed from the free version, as it was early, experimental, slow, mostly broken and unmaintained code.
For more information on the other changes within this version please review the official changelogs here